Display panel and display device

Abstract

A display panel and a display device, the display panel comprising a display substrate (100), a first light extraction layer (17) and a second light extraction layer (18); the display substrate (100) comprises a plurality of sub-pixels (20); the first light extraction layer (17) is arranged on the light-emitting side of the display substrate (100), the first light extraction layer (17) comprises a plurality of first protrusions (171), the orthographic projection of the first protrusion (171) on the display substrate (100) overlaps the orthographic projection of the sub-pixel (20) on the display substrate (100); the second light extraction layer (18) is arranged on the light-emitting side of the display substrate (100) and covers at least part of the first protrusion (171), the second light extraction layer (18) comprises a plurality of first grooves (181), the orthographic projection of the first protrusion (171) on the display substrate (100) overlaps the orthographic projection of the first groove (181) on the display substrate (100), and the refractive index of the second light extraction layer (18) is smaller than the refractive index of the first light extraction layer (17). The display panel has high light extraction efficiency.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, in particular, to a display panel and a display device. BACKGROUND

[0002] With the progress of science and technology and the improvement of social living standards, consumers' requirements for display products are increasing. For display manufacturers, producing high-resolution and high-quality display products is the definite development direction.

[0003] However, the current display products have low light extraction efficiency.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present disclosure is to overcome the shortcomings of the prior art and provide a display panel and a display device.

[0006] According to one aspect of the present disclosure, a display panel is provided, comprising:

[0007] a display substrate comprising a plurality of sub-pixels;

[0008] a first light extraction layer disposed on the light exit side of the display substrate, the first light extraction layer comprising a plurality of first protrusions, a projection of the first protrusions on the display substrate overlapping a projection of the sub-pixels on the display substrate;

[0009] a second light extraction layer disposed on the light exit side of the display substrate and covering at least part of the first protrusions, the second light extraction layer comprising a plurality of first grooves, a projection of the first protrusions on the display substrate overlapping a projection of the first grooves on the display substrate, and a refractive index of the second light extraction layer being less than a refractive index of the first light extraction layer.

[0010] In an exemplary embodiment of the present disclosure, the display panel further comprises:

[0011] a third light extraction layer disposed on a side of at least part of the second light extraction layer away from the display substrate, at least part of the third light extraction layer being located in the first grooves, and a refractive index of the third light extraction layer being greater than a refractive index of the second light extraction layer.

[0012] In an example embodiment of the present disclosure, a height of a sidewall of the first protrusion in a second direction perpendicular to a display surface of the display substrate decreases as a distance from a center of the sub-pixel in a first direction parallel to the display surface of the display substrate increases.

[0013] In an example embodiment of the present disclosure, the sub-pixel is located on a same side of a first normal of the sidewall of the first protrusion as the second light extraction layer.

[0014] In an example embodiment of the present disclosure, an angle between the sidewall of the first protrusion and the display surface of the display substrate is a,

[0015] a > arctan[(a+b) / h];

[0016] wherein a is a distance between an edge of the first protrusion and an edge of the sub-pixel in the first direction, b is a length of the sub-pixel in the first direction, and h is a distance between the first protrusion and the sub-pixel in the second direction.

[0017] In an example embodiment of the present disclosure, a height of a groove sidewall of the first groove in the second direction increases as a distance from a center of the sub-pixel in the first direction increases.

[0018] In an example embodiment of the present disclosure, an angle between the groove sidewall of the first groove and the display surface of the display substrate is b,

[0019] b > arctan[h / (a+b)];

[0020] wherein a is a distance between an edge of the first protrusion and an edge of the sub-pixel in the first direction, b is a length of the sub-pixel in the first direction, and h is a distance between the first protrusion and the sub-pixel in the second direction.

[0021] In an example embodiment of the present disclosure, the display panel further comprises:

[0022] a color filter layer disposed on an out-coupling side of the display substrate, the color filter layer comprising a light filtering portion and a light blocking portion.

[0023] In an example embodiment of the present disclosure, the color filter layer is disposed on a side of the second light extraction layer away from the display substrate, and at least part of the light filtering portion is multiplexed as the third light extraction layer.

[0024] In an example embodiment of the present disclosure, the light filtering portion includes a first portion and a second portion arranged in sequence, the first portion is closer to the second light extraction layer than the second portion, and the first portion is multiplexed as a second protruding portion of the third light extraction layer.

[0025] In an example embodiment of the present disclosure, a height of a groove sidewall of the first groove in the second direction decreases as a distance from a center of the sub-pixel in the first direction increases.

[0026] In an example embodiment of the present disclosure, a sidewall of the first protruding portion is located on a same side of a second normal of the groove sidewall of the first groove and is located on a side of the second normal close to the display substrate, and the sidewall of the first protruding portion and the groove sidewall of the first groove are located on a same side of a same cross section in the second direction.

[0027] In an example embodiment of the present disclosure, the third light extraction layer is arranged in the first groove, and the third light extraction layer arranged in the first groove is a second protruding portion.

[0028] In an example embodiment of the present disclosure, the second light extraction layer includes:

[0029] a first layer arranged on a light exit side of the display substrate and covering at least part of the first protruding portion;

[0030] a second layer arranged on a side of the first layer away from the display substrate, and the first groove is arranged in the second layer.

[0031] In an example embodiment of the present disclosure, the display panel further includes:

[0032] a color film layer arranged on a side of the first light extraction layer and the first layer away from the display substrate, the color film layer including a light filtering portion and a light shielding portion, and the second layer is arranged on a side of the color film layer away from the display substrate.

[0033] In an example embodiment of the present disclosure, at least part of the light filtering portion is multiplexed as the third light extraction layer.

[0034] In an example embodiment of the present disclosure, the light filtering portion includes a first portion and a second portion arranged in sequence, the first portion is closer to the second light extraction layer than the second portion, and the second portion is multiplexed as the third light extraction layer.

[0035] In an example embodiment of the present disclosure, the second light extraction layer further includes:

[0036] A third layer is arranged between the first layer and the second layer, and the third layer is located on a side of the color film layer away from the display substrate.

[0037] In an example embodiment of the present disclosure, the first recess is arranged as a via hole.

[0038] In an example embodiment of the present disclosure, the display panel further comprises:

[0039] A package layer group is arranged between the display substrate and the first light extraction layer.

[0040] A circular polarizer is arranged on a side of the third light extraction layer away from the display substrate.

[0041] A cover plate is arranged on a side of the circular polarizer away from the display substrate.

[0042] According to another aspect of the present disclosure, there is provided a display device comprising the display panel as described in any one of the above.

[0043] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0045] Figure 1 Structure schematic diagram of a first example embodiment of the display panel of the present disclosure.

[0046] Figure 2 Structure schematic diagram of a second example embodiment of the display panel of the present disclosure. Figure 1 Structure schematic diagram of a third example embodiment of the display panel of the present disclosure.

[0047] Figure 3 First schematic diagram of the side wall refraction principle of the first protruding part.

[0048] Figure 4 Second schematic diagram of the side wall refraction principle of the first protruding part.

[0049] Figure 5 Schematic diagram of the critical value calculation principle of the side wall inclination angle of the first protruding part.

[0050] Figure 6 Schematic diagram of the light path of the display panel in the first example embodiment of the present disclosure. Figure 1 Schematic diagram of the light path of the display panel in the second example embodiment of the present disclosure.

[0051] Figure 7 Schematic diagram for critical value calculation principle of groove side wall inclination angle of first groove.

[0052] Figure 8 Schematic diagram of structure of second example embodiment of display panel of the present disclosure.

[0053] Figure 9 Schematic diagram of structure of Figure 8 Top view schematic diagram of display panel.

[0054] Figure 10 Schematic diagram of structure of third example embodiment of display panel of the present disclosure.

[0055] Figure 11 Schematic diagram of structure of Figure 10 Top view schematic diagram of display panel.

[0056] Figure 12 Schematic diagram of structure of fourth example embodiment of display panel of the present disclosure.

[0057] Figure 13 Schematic diagram of structure of Figure 12 Top view schematic diagram of display panel.

[0058] Figure 14 Schematic diagram of structure of fifth example embodiment of display panel of the present disclosure.

[0059] Figure 15 Schematic diagram of structure of Figure 14 Top view schematic diagram of display panel.

[0060] Figure 16 Schematic diagram of structure of sixth example embodiment of display panel of the present disclosure.

[0061] Figure 17 Schematic diagram of structure of seventh example embodiment of display panel of the present disclosure.

[0062] Explanation of reference signs:

[0063] 1, substrate substrate; 2, light shielding layer; 3, buffer layer;

[0064] 4, active layer; 41, conductor part; 42, channel part;

[0065] 5, gate insulating layer; 6, gate electrode;

[0066] 7, interlayer dielectric layer; 71, first via hole;

[0067] 81, source electrode; 82, drain electrode;

[0068] 9, planarization layer; 91, second via hole;

[0069] 10, first electrode;

[0070] 11, pixel definition layer; 111, third via hole;

[0071] 12, light emitting layer group; 13, second electrode;

[0072] 14, encapsulation layer group;

[0073] 15, circular polarizer; 151, 1 / 4 wave plate; 152, polarizer;

[0074] 16, cover plate;

[0075] 17, first light extraction layer; 171, first protruding portion;

[0076] 18, second light extraction layer; 181, first groove; 182, first layer; 183, second layer; 184, third layer;

[0077] 19, third light extraction layer; 191, second protruding portion; 192, flat plate portion;

[0078] 20, sub-pixel;

[0079] 21, color filter layer; 211, light filtering portion; 2111, first portion; 2112, second portion; 2113, third portion; 212, light shielding portion; 2121, fourth via hole;

[0080] X, first direction; Y, second direction; 100, display substrate. DETAILED DESCRIPTION

[0081] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and descriptions of the same or similar elements can be not be repeated. In addition, the drawings are only schematic and are non-limiting, exemplary, and illustrative.

[0082] Although the terms relative, such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the icon to another component, these terms are used in this specification only for convenience, for example, in the direction of the example described in the accompanying drawings. It can be understood that if the device of the icon is turned upside down, the component described as "upper" will become the component described as "lower". When a structure is "on" another structure, it can mean that the structure is integrally formed on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0083] The terms "one", "a", "an", "the", and "at least one" are used to indicate that "one or more" of something is / are present; the terms "comprises", "comprising", "has", "having", "includes", "including", "contains", "containing" and variants thereof are used to indicate an open-ended inclusion of the stated element(s) and do not preclude additional elements being present; the terms "first", "second" and "third" and the like are used merely as labels, and are not meant to impose numerical requirements on their objects.

[0084] The example embodiments of the present disclosure provide a display panel, referring to Figures 1-17 As shown in the figure, the display panel can include a display substrate 100, a first light extraction layer 17 and a second light extraction layer 18; the display substrate 100 can include a plurality of sub-pixels 20; the first light extraction layer 17 is arranged on the light-out side of the display substrate 100, and the first light extraction layer 17 can include a plurality of first protrusions 171, the orthographic projection of the first protrusions 171 on the display substrate 100 overlaps the orthographic projection of the sub-pixels 20 on the display substrate 100; the second light extraction layer 18 is arranged on the light-out side of the display substrate 100 and covers at least part of the first protrusions 171, and the second light extraction layer 18 can include a plurality of first grooves 181, the orthographic projection of the first protrusions 171 on the display substrate 100 overlaps the orthographic projection of the first grooves 181 on the display substrate 100, and the refractive index of the second light extraction layer 18 is less than the refractive index of the first light extraction layer 17.

[0085] It should be noted that the overlap can be partial overlap or full overlap.

[0086] The orthographic projection of the first protrusions 171 on the display substrate 100 overlaps the orthographic projection of the sub-pixels 20 on the display substrate 100, which can be that the orthographic projection of the first protrusions 171 on the display substrate 100 partially overlaps the orthographic projection of the sub-pixels 20 on the display substrate 100; or the orthographic projection of the first protrusions 171 on the display substrate 100 fully overlaps the orthographic projection of the sub-pixels 20 on the display substrate 100, for example, the orthographic projection of the first protrusions 171 on the display substrate 100 can completely cover the sub-pixels 20, or the orthographic projection of the first protrusions 171 on the display substrate 100 can be located within the sub-pixels 20. As long as the orthographic projection of the first protrusions 171 on the display substrate 100 overlaps the sub-pixels 20, the first protrusions 171 can converge at least part of the light, so as to improve the light-out efficiency.

[0087] The orthographic projection of the first protruding portion 171 on the display substrate 100 overlaps with the orthographic projection of the first groove 181 on the display substrate 100, which can be that the orthographic projection of the first protruding portion 171 on the display substrate 100 partially overlaps with the orthographic projection of the first groove 181 on the display substrate 100, or that the orthographic projection of the first protruding portion 171 on the display substrate 100 fully overlaps with the orthographic projection of the first groove 181 on the display substrate 100, for example, that the orthographic projection of the first protruding portion 171 on the display substrate 100 is located within the orthographic projection of the first groove 181 on the display substrate 100, or that the orthographic projection of the first groove 181 on the display substrate 100 is located within the orthographic projection of the first protruding portion 171 on the display substrate 100. As long as the orthographic projection of the first protruding portion 171 on the display substrate 100 overlaps with the orthographic projection of the first groove 181 on the display substrate 100, the first groove 181 can converge at least part of the light, so as to improve the light extraction efficiency

[0088] The display panel of the present disclosure can make the light emitted from the sub-pixel 20 almost all be incident on the first protruding portion 171, the central light has a small incident angle and will not be totally reflected, and can be emitted through the first light extraction layer 17 and the second light extraction layer 18; the peripheral light has a large incident angle and can be totally reflected on the sidewall of the first protruding portion 171, or part of the peripheral light has a small incident angle with the sidewall of the first protruding portion 171, and the emitted light from the sub-pixel 20 can be refracted to generate refracted light on the sidewall, and because the refractive index of the second light extraction layer 18 is smaller than the refractive index of the first light extraction layer 17, the refracted light is more convergent, so as to improve the light extraction efficiency of the front of the display panel, and thus, under the same brightness requirement, the power consumption of the display panel can be reduced; the light extraction efficiency of the side of the display panel is reduced, and the privacy effect is increased; the sidewall of the first groove 181 forms a refractive surface or a total reflection surface, the refracted light is totally reflected or refracted again through the sidewall of the first groove 181, the angle of the refracted light is changed, so that the emitted light can be emitted substantially perpendicular to the display surface of the display substrate 100, and thus, the light extraction efficiency of the front of the display panel is further improved, and thus, under the same brightness requirement, the power consumption of the display panel can be further reduced; the light extraction efficiency of the side of the display panel is reduced, and the privacy effect is increased; and the color crosstalk can be reduced, and the display effect is improved.

[0089] The display substrate 100 can be an OLED (Organic Electroluminescence Display) display substrate, a QLED (Quantum Dot Light Emitting Diodes) display substrate 100, etc. The display substrate 100 has a light-emitting side and a non-light-emitting side, the light-emitting side is arranged opposite to the non-light-emitting side, a display picture can be displayed on the light-emitting side, and one side of the display picture is a display surface. The OLED display substrate has the characteristics of self-emission, high brightness, wide viewing angle, fast response time, and can be made of R, G, and B full-color components, and is therefore considered as a star product of the next generation display.

[0090] Referring to Figure 1 The following will be described taking the OLED as an example.

[0091] The display substrate 100 can include a driving backboard and a light-emitting device, the driving backboard can include a driving circuit, and the driving circuit can drive the light-emitting device to emit light.

[0092] In the example embodiment, the driving backboard can include a substrate 1, and a material of the substrate 1 can include an inorganic material, for example, the inorganic material can be glass, quartz, metal, etc. The material of the substrate 1 can also include an organic material, for example, the organic material can be a resin material such as polyimide, polycarbonate, polyacrylate, polyetherimide, polyethersulfone, polyethylene terephthalate, and polyethylene naphthalate, etc. The substrate 1 can be formed by a plurality of material layers, for example, the substrate 1 can include a plurality of base layers, and a material of the base layer can be any one of the above materials. Of course, the substrate 1 can also be provided as a single layer, and can be any one of the above materials.

[0093] An optical shielding layer 2 can also be formed on one side of the substrate 1. Light rays entering the active layer 4 from the substrate 1 can generate photo-generated carriers in the active layer 4, which can greatly affect the characteristics of the thin film transistor and ultimately affect the display quality of the display device. The optical shielding layer 2 can shield the light rays entering from the substrate 1, thereby avoiding affecting the characteristics of the thin film transistor and avoiding affecting the display quality of the display device.

[0094] A buffer layer 3 can also be formed on the side of the optical shielding layer 2 away from the substrate 1. The buffer layer 3 can block water vapor and impurity ions in the substrate 1 (especially the organic material), and can also increase hydrogen ions for the subsequently formed active layer 4. The buffer layer 3 is made of an insulating material, which can insulate and isolate the optical shielding layer 2 and the active layer 4.

[0095] The source layer 4 is provided on the side of the buffer layer 3 away from the substrate substrate 1, and can include a channel portion 42 and a conductor portion 41 provided at both ends of the channel portion 42. The gate insulating layer 5 is provided on the side of the source layer 4 away from the substrate substrate 1. The gate electrode 6 is provided on the side of the gate insulating layer 5. The interlayer dielectric layer 7 is provided on the side of the gate electrode 6 away from the substrate substrate 1. The first via hole 71 is provided on the interlayer dielectric layer 7 and is connected to the conductor portion 41. The source electrode 81 and the drain electrode 82 are provided on the side of the interlayer dielectric layer 7 away from the substrate substrate 1, and are respectively connected to the two conductor portions 41 through the two first via holes 71. The planarization layer 9 is provided on the side of the source electrode 81 and the drain electrode 82 away from the substrate substrate 1. The second via hole 91 is provided on the planarization layer 9 and is connected to the source electrode 81. The source layer 4, the gate electrode 6, the source electrode 81, and the drain electrode 82 form a thin film transistor.

[0096] It should be noted that the thin film transistor described in the present specification is a top-gate type thin film transistor. In other example embodiments of the present disclosure, the thin film transistor can also be a bottom-gate type or a dual-gate type, and the specific structure thereof will not be described here. Moreover, in the case of using a thin film transistor with opposite polarity or in the case of changing the current direction in circuit operation, the functions of the "source electrode 81" and the "drain electrode 82" are sometimes exchanged with each other. Therefore, in the present specification, the "source electrode 81" and the "drain electrode 82" can be exchanged with each other.

[0097] The light emitting device is provided on the side of the planarization layer 9 away from the substrate substrate 1, and can include the first electrode 10, the pixel definition layer 11, the light emitting layer group 12, and the second electrode 13.

[0098] Specifically, the first electrode 10 is provided on the side of the planarization layer 9 away from the substrate substrate 1, and is connected to the source electrode 81 of the driving backplane through the second via hole 91. The first electrode 10 can be an anode.

[0099] The pixel definition layer 11 is provided on the side of the first electrode 10 away from the substrate substrate 1. The third via hole 111 is provided on the pixel definition layer 11. The light emitting layer group 12 is provided in the third via hole 111. The second electrode 13 is provided on the side of the light emitting layer group 12 away from the substrate substrate 1. The second electrode 13 can be a cathode and is connected to a ground wire VSS. The light emitting layer group 12 in one third via hole 111 emits light to form one sub-pixel 20. Therefore, the light emitting layer group 12 in one third via hole 111 is one sub-pixel 20, so that the orthographic projection of the sub-pixel 20 on the display substrate 100 is the orthographic projection of the light emitting layer group 12 on the display substrate 100. The display substrate 100 can include a plurality of sub-pixels 20.

[0100] The light-emitting layer group 12 may include a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer stacked sequentially. The hole injection layer is in contact with the first electrode 10, and the electron injection layer is in contact with the second electrode 13. Of course, in other exemplary embodiments of this disclosure, the light-emitting layer group 12 may only include a hole transport layer, a light-emitting layer, and an electron transport layer. The light-emitting layer group 12 may also have other structures, and its specific structure can be set as needed.

[0101] An encapsulation layer group 14 is provided on the side of the second electrode away from the substrate 1. The encapsulation layer group 14 can be configured as multiple layers. The encapsulation layer group 14 may include organic layers and inorganic layers. The specific materials and number of layers will not be described here.

[0102] Reference Figure 1 As shown, a first light extraction layer 17 is provided on the side of the encapsulation layer group 14 away from the substrate 1. The first light extraction layer 17 may include a plurality of first protrusions 171.

[0103] Reference Figure 2 As shown, the first protrusion 171 corresponds one-to-one with the sub-pixel 20. Specifically, the number of first protrusions 171 is the same as the number of sub-pixels 20, and the shape of the first protrusion 171 is the same as the shape of the sub-pixel 20. For example, if the sub-pixel 20 is set to a circle, the first protrusion 171 is also set to a circle; if the sub-pixel 20 is set to a rectangle, the first protrusion 171 is also set to a rectangle. Of course, in other exemplary embodiments of this disclosure, the shape of the sub-pixel 20 and the shape of the first protrusion 171 can also be other shapes, which will not be described in detail here.

[0104] The orthographic projection of the first protrusion 171 on the display substrate 100 covers the sub-pixel 20, that is, the orthographic projection of the first protrusion 171 on the display substrate 100 coincides with the sub-pixel 20, or the edge of the sub-pixel 20 is located within the edge of the orthographic projection of the first protrusion 171 on the display substrate 100.

[0105] The first protrusion 171 may include a bottom wall, a top wall, and a side wall. The bottom wall and the top wall are parallel to the display surface, and the side wall intersects the display surface. The height of the side wall of the first protrusion 171 in the second direction Y decreases as the distance from the center of the sub-pixel 20 in the first direction X increases. The second direction Y is perpendicular to the display surface of the display substrate 100, and the first direction X is parallel to the display surface of the display substrate 100. For example, the side wall of the first protrusion 171 may be configured as an inclined surface, such that the first protrusion has a structure that decreases in size as the distance from the display substrate 100 increases. This configuration results in a smaller incident angle of emitted light at the side wall of the first protrusion 171, avoiding total internal reflection of the emitted light and instead allowing the emitted light to be refracted.

[0106] Of course, in other example embodiments of the present disclosure, the edge of the top wall of the first protrusion 171 can be provided with a round chamfer, that is, the top wall of the first protrusion 171 is smoothly connected with the side wall through a circular arc; or the side wall of the first protrusion 171 can be provided as a circular arc surface, that is, the first protrusion 171 can be a truncated hemispherical or less hemispherical structure.

[0107] Referring to Figure 3 As shown in FIG. 6, when the sub-pixel 20 is located on both sides of the first normal L1 of the side wall of the first protrusion 171, different parts will produce two completely opposite refraction effects. The emergent light emitted from the m section is refracted towards the side close to the substrate 1, so that the refracted light is more dispersed; the emergent light emitted from the n section is refracted towards the side away from the substrate 1, so that the refracted light is more convergent, which can be emitted from the front of the display panel, thereby improving the light extraction efficiency of the display panel.

[0108] Therefore, referring to Figure 4 As shown in FIG. 7, in order to make the emergent light emitted by the sub-pixel 20 produce a convergent effect after passing through the first protrusion 171, the sub-pixel 20 needs to be arranged on the same side of the first normal L1 of the side wall of the first protrusion 171, and on the side away from the second light extraction layer 18, that is, the sub-pixel 20 is located on the side of the n section. The angle of the emergent light is certain, and the inclination of the side wall of the first protrusion 171, that is, the included angle between the side wall of the first protrusion 171 and the display surface of the display substrate 100, can be adjusted to achieve the above purpose.

[0109] Referring to Figure 5 As shown in FIG. 8, the included angle between the side wall of the first protrusion 171 and the display surface of the display substrate 100 is α, that is, the inclination angle of the side wall of the first protrusion 171 is α. When the inclination angle of the side wall of the first protrusion 171 is the smallest, the first normal L1 of the side wall connects the opposite sides of the sub-pixel 20 and the first protrusion 171, and therefore,

[0110] α≥arctan[(a+b) / h];

[0111] Wherein, a is the distance between the edge of the first protrusion 171 and the edge of the sub-pixel 20 in the first direction X, and the edge of the first protrusion 171 and the edge of the sub-pixel 20 are the same side edges on the same cross section, and the cross section is also the cross section along the second direction Y, and the value of a is greater than zero; b is the length of the sub-pixel 20 in the first direction X; h is the distance between the first protrusion 171 and the sub-pixel 20 in the second direction Y.

[0112] When the pixel density of the display substrate 100 is 400, the included angle α between the side wall of the first protrusion 171 and the display surface of the display substrate 100 can be calculated to be greater than or equal to 70°. When the pixel density increases, b will be reduced to a certain extent, and the minimum degree of the included angle α (critical angle) will also be reduced to a certain extent.

[0113] The thickness of the first protrusion 171 is greater than or equal to 1 micrometer and less than or equal to 5 micrometers.

[0114] Of course, when the included angle a is less than the critical angle, there is also a certain converging effect on the outgoing light.

[0115] Referring to Figure 1 and Figure 6 As shown in FIG. 1, a second light extraction layer 18 is arranged on the light-emitting side of the display substrate 100, and the second light extraction layer 18 covers at least part of the first protrusion 171; that is, part of the second light extraction layer 18 is located on the light-emitting side of the display substrate 100, and another part of the second light extraction layer 18 is located on the side of the at least part of the first protrusion 171 away from the display substrate 100.

[0116] The second light extraction layer 18 can include a plurality of first grooves 181, and the first grooves 181 are in one-to-one correspondence with the first protrusions 171. Specifically, the number of the first grooves 181 is the same as the number of the first protrusions 171, and the shape of the first grooves 181 is the same as the shape of the first protrusions 171, for example, the first protrusions 171 are arranged in a circular shape, and the first grooves 181 are also arranged in a circular shape; the first protrusions 171 are arranged in a rectangular shape, and the first grooves 181 are also arranged in a rectangular shape; of course, in other example embodiments of the present disclosure, the shape of the first protrusions 171 and the shape of the first grooves 181 can also be other shapes, which are not described one by one here.

[0117] The thickness of the second light extraction layer 18 is greater than 0 and less than or equal to 5 micrometers, and the depth of the first groove 181 is greater than 0 and less than or equal to 5 micrometers.

[0118] Referring to Figure 2 As shown in FIG. 1, the orthographic projection of the first protrusion 171 on the display substrate 100 is located within the orthographic projection of the first groove 181 on the display substrate 100, that is, the edge of the orthographic projection of the first protrusion 171 on the display substrate 100 coincides with the edge of the orthographic projection of the first groove 181 on the display substrate 100, or the edge of the orthographic projection of the first protrusion 171 on the display substrate 100 is located inside the edge of the orthographic projection of the first groove 181 on the display substrate 100.

[0119] The refractive index of the second light extraction layer 18 is less than the refractive index of the first light extraction layer 17, so that the light rays from the side wall of the first protrusion 171 to the second light extraction layer 18 are bent away from the display substrate 100, thereby making the refracted light more convergent, which can be emitted from the front of the display panel, thereby improving the light-emitting efficiency of the display panel.

[0120] The first recess 181 can include a groove bottom wall parallel to the display surface and a groove side wall intersecting the display surface. The height of the groove side wall of the first recess 181 in the second direction Y increases as the distance from the center of the sub-pixel 20 in the first direction X increases. For example, the groove side wall of the first recess 181 can be provided as an inclined surface, and the first recess 181 can be configured to increase in size as the distance from the display substrate 100 increases. With this configuration, the incident angle of the refracted light at the groove side wall of the first recess 181 is large, and the refracted light can be totally reflected at the groove side wall of the first recess 181.

[0121] Of course, in other example embodiments of the disclosure, the edge of the groove bottom wall of the first recess 181 can be provided with a round chamfer, i.e., the groove bottom wall of the first recess 181 is smoothly connected to the groove side wall by a circular arc; the edge of the groove side wall of the first recess 181 away from the groove bottom wall can also be provided with a round chamfer, and the above two round chamfers can be provided with one or both. The groove side wall of the first recess 181 can be provided as a circular arc surface.

[0122] When the emergent light is refracted by the side wall of the first protrusion 171 and then hits the groove side wall of the first recess 181, if the included angle between the refracted light and the display surface is greater than the inclination angle β of the groove side wall of the first recess 181, the refracted light will not be totally reflected, resulting in the groove side wall of the first recess 181 losing its effect. Therefore, the inclination angle β of the groove side wall of the first recess 181 needs to be limited, and the specific limitation is as follows:

[0123] Referring to Figure 7 As can be seen from the above description of the inclination angle of the side wall of the first protrusion, the inclination angle of the side wall of the first protrusion has a minimum value α0. When the inclination angle of the side wall of the first protrusion is the minimum value α0, the emergent light emitted from the sub-pixel 20 opposite the side wall of the first protrusion is perpendicular to the side wall of the first protrusion, so that the side wall of the first protrusion does not refract the emergent light, i.e., the emergent light is not deflected. The angle β0 of the refracted light formed after the emergent light passes through the first protrusion 171 is also the minimum value. If the inclination angle β of the groove side wall of the first recess 181 is less than β0, the groove side wall of the first recess 181 will lose its effect.

[0124] Therefore, the inclination angle β of the groove side wall of the first recess 181 needs to be limited, and the included angle between the groove side wall of the first recess 181 and the display surface of the display substrate 100 is β, i.e., the inclination angle β of the groove side wall of the first recess 181 can be calculated by the following formula:

[0125] β > arctan [h / (a + b)];

[0126] Wherein, a is the distance between the edge of the first protrusion 171 and the edge of the sub-pixel 20 in the first direction X, b is the length of the sub-pixel 20 in the first direction X, and h is the distance between the first protrusion 171 and the sub-pixel 20 in the second direction Y.

[0127] When the pixel density of the display substrate 100 is 400, it can be calculated that the included angle β between the groove side wall of the first groove 181 and the display surface of the display substrate 100 is greater than 35°. When the pixel density increases, b will be reduced to a certain extent, and the minimum degree (critical angle) of the included angle β will also increase to a certain extent.

[0128] Of course, when the included angle β is less than the critical angle, there is also a certain convergence effect on the refracted light.

[0129] Please continue to refer to Figure 1 , Figure 6 and Figure 7 , the third light extraction layer 19 is arranged on the side of the second light extraction layer 18 away from the display substrate 100, and part of the third light extraction layer 19 is arranged in the first groove 181 to form a second protrusion 191. Specifically, the third light extraction layer 19 can include a flat plate portion 192 and the second protrusion 191, the second protrusion 191 is arranged on the side of the flat plate portion 192 close to the display substrate 100, so that the second protrusion 191 protrudes towards the display substrate 100, and the interface between the side wall of the second protrusion 191 and the groove side wall of the first groove 181 can form a total reflection interface.

[0130] Referring to Figure 8 , the refractive index of the third light extraction layer 19 can be greater than the refractive index of the second light extraction layer 18, so that part of the refracted light incident on the groove side wall of the first groove 181 is totally reflected and converges, and another part of the refracted light incident on the interface between the third light extraction layer 19 and the second light extraction layer 18 parallel to the display surface is refracted again, and the refraction angle is less than the incident angle, so that the light is more convergent. The thickness of the third light extraction layer 19 is greater than 0 and less than or equal to 5 microns.

[0131] The forming process of the second light extraction layer 18 and the third light extraction layer 19 is that a second light extraction material layer is first formed, then the second light extraction material layer is etched to form the first groove 181 and the second light extraction layer 18, and finally the third light extraction layer 19 is deposited on the side of the second light extraction layer 18 away from the display substrate 100, and the third light extraction layer 19 will naturally form the second protrusion 191 in the first groove 181.

[0132] Referring to Figure 8The structural schematic diagram of the second example embodiment is shown. The main difference between the second example embodiment and the first example embodiment is that the first groove 181 on the second light extraction layer 18 can be set as a via hole penetrating through the second light extraction layer 18, so that the first protruding part 171 and the second protruding part 191 are in contact, and this structure can also achieve the effect of converging the outgoing light. Other structures are the same as those of the first example embodiment, which will not be described here.

[0133] Referring to Figure 9 As shown in the second example embodiment, the orthographic projection of the first protruding part 171 on the display substrate 100 covers the sub-pixel 20, and the orthographic projection of the first protruding part 171 on the display substrate 100 is located within the orthographic projection of the first groove 181 on the display substrate 100.

[0134] It should be noted that, since the sidewall of the first protruding part 171 is inclined, the range of the orthographic projection of the first protruding part 171 on the display substrate 100 refers to the orthographic projection of the outermost edge of the first protruding part 171 on the display substrate 100, that is, the sub-pixel 20 is located within the orthographic projection of the outermost edge of the first protruding part 171 on the display substrate 100. Since the groove sidewall of the first groove 181 is inclined, the range of the orthographic projection of the first groove 181 on the display substrate 100 refers to the orthographic projection of the side of the first groove 181 close to the display substrate 100 (the groove bottom surface) on the display substrate 100, that is, the orthographic projection of the outermost edge of the first protruding part 171 on the display substrate 100 is located within the orthographic projection of the groove bottom surface of the first groove 181 on the display substrate 100.

[0135] Referring to Figure 10 The structural schematic diagram of the third example embodiment is shown. The main difference between the third example embodiment and the first example embodiment is that the display panel can further include a color filter layer 21, and the color filter layer 21 can include a light filtering part 211 and a light shielding part 212. The light filtering part 211 can include a red light filtering part, a green light filtering part, and a blue light filtering part. The red light filtering part transmits red light, the green light filtering part transmits green light, and the blue light filtering part transmits blue light.

[0136] The color film layer 21 is arranged on the light-out side of the display substrate 100, and specifically, the color film layer 21 is arranged on the side of the second light extraction layer 18 away from the display substrate 100. The light shielding part 212 is arranged outside the first groove 181, that is, the fourth via hole 2121 is arranged on the light shielding part 212, the hole wall of the fourth via hole 2121 is connected with the groove wall of the first groove 181, and the inclination angles are consistent. Part of the light filtering part 211 is arranged in the first groove 181 to form the second protruding part 191, and another part of the light filtering part 211 is arranged on the side of the light shielding part 212 and the second protruding part 191 away from the display substrate 100 to form the flat plate part 192. The part of the light filtering part 211 can be reused as the third light extraction layer 19, that is, the light filtering part 211 can play the role of light filtering as the light filtering part 211, and can play the role of converging refracted light in cooperation with the second light extraction layer 18 as the third light extraction layer 19. The other structures are the same as those in the first example embodiment, and will not be described here.

[0137] Specifically, the light filtering part can include a first part 2111, a second part 2112 and a third part 2113 arranged in sequence. The first part 2111 is closer to the second light extraction layer than the second part 2112, the side wall of the first part 2111 is fitted with the groove side wall of the first groove, that is, the side wall of the first part 2111 is fitted with the second light extraction layer; the first part 2111 is reused as the second protruding part of the third light extraction layer, and the refracted light produces total reflection on the side wall of the first part 2111. The side wall of the second part 2112 is fitted with the groove side wall of the fourth via hole 2121, that is, the side wall of the second part 2112 is fitted with the light shielding part. The third part 2113 is arranged on the side of the second part 2112 and the light shielding part away from the display substrate. The second part 2112 and the third part 2113 are collectively reused as the flat plate part 192 of the third light extraction layer.

[0138] Reusing part of the color film layer 21 as the second protruding part 191 can reduce the process flow of manufacturing the second protruding part 191 by one step, increase the manufacturing efficiency, and reduce the cost.

[0139] Referring to Figure 11 As shown in the third example embodiment, the orthographic projection of the first protruding part 171 on the display substrate 100 covers the sub-pixel 20, and the orthographic projection of the first protruding part 171 on the display substrate 100 is located in the orthographic projection of the first groove 181 on the display substrate 100. The orthographic projection of the first groove 181 on the display substrate 100 is located in the orthographic projection of the fourth via hole 2121 on the light shielding part 212 on the display substrate 100.

[0140] It should be noted that, since the hole wall of the fourth via hole 2121 is inclinedly arranged, the orthographic projection of the fourth via hole 2121 on the display substrate 100 refers to the orthographic projection of the edge of the fourth via hole 2121 close to the display substrate 100 on the display substrate 100, that is, the orthographic projection of the first groove 181 on the display substrate 100 is located in the orthographic projection of the edge of the fourth via hole 2121 close to the display substrate 100 on the display substrate 100. The orthographic projection of the first protruding portion 171 on the display substrate 100 and the orthographic projection of the first groove 181 on the display substrate 100 have been described in detail above, and thus will not be described here again.

[0141] Referring to Figure 12 The main difference between the fourth example embodiment and the third example embodiment is that the first groove 181 on the second light extraction layer 18 can be arranged as a via hole penetrating through the second light extraction layer 18, so that the first protruding portion 171 and the second protruding portion 191 are in contact, that is, the first protruding portion 171 is in contact with the light filtering portion 211. This structure also has the effect of converging the outgoing light. Other structures are the same as those of the third example embodiment, and thus will not be described here again.

[0142] Referring to Figure 13 In the fourth example embodiment, the orthographic projection of the first protruding portion 171 on the display substrate 100 covers the sub-pixel 20, and the orthographic projection of the first protruding portion 171 on the display substrate 100 is located in the orthographic projection of the first groove 181 on the display substrate 100. The orthographic projection of the first groove 181 on the display substrate 100 is located in the orthographic projection of the fourth via hole 2121 on the display substrate 100. The orthographic projection of the first protruding portion 171 on the display substrate 100, the orthographic projection of the first groove 181 on the display substrate 100, and the orthographic projection of the fourth via hole 2121 on the display substrate 100 have been described in detail above, and thus will not be described here again.

[0143] Referring to Figures 14-17 As shown in FIG. 13, the height of the sidewall of the first groove 181 in the second direction Y decreases with the increase of the distance of the sub-pixel 20 in the first direction X. The third light extraction layer 19 is arranged only in the first groove 181 to form the second protruding portion 191, that is, the third light extraction layer 19 only includes the second protruding portion 191. The refracted light refracted by the first protruding portion 171 is refracted again between the second protruding portion 191 and the second light extraction layer 18, and since the refractive index of the third light extraction layer 19 is greater than the refractive index of the second light extraction layer 18, the refraction angle is greater than the incidence angle, so that the light converges and is emitted from the front of the display panel, thereby improving the light extraction efficiency.

[0144] Referring to Figure 14As shown, the second light extraction layer 18 can include a first layer 182 and a second layer 183, the second layer 183 is disposed on the side of the first layer 182 away from the display substrate 100. The first layer 182 is disposed on the light-out side of the display substrate 100, specifically, the first layer 182 is disposed on the side of the encapsulation layer group 14 and the first light extraction layer 17 away from the display substrate 100, so that the first layer 182 completely covers the first light extraction layer 17. The first groove 181 is disposed on the second layer 183 and is located on the side of the second layer 183 close to the display substrate 100, so that the second layer 183 covers the third light extraction layer 19 (the second protruding portion 191).

[0145] Since the refracted light emitted from the side wall of the first protruding portion 171 is best emitted to the side wall of the second protruding portion 191 to refract the refracted light again, and the refracted light emitted from the side wall of the first protruding portion 171 needs to be located on the same side of the second normal line L2 of the side wall of the second protruding portion 191, specifically, needs to be located on the side of the second normal line L2 of the side wall of the second protruding portion 191 close to the display substrate 100, so as to have the effect of converging the refracted light. Moreover, the side wall of the first protruding portion 171 and the groove side wall of the first groove 181 (the side wall of the second protruding portion 191) are located on the same cross section along the second direction Y, and the side wall of the first protruding portion 171 and the groove side wall of the first groove 181 (the side wall of the second protruding portion 191) are located on the same side, for example, Figure 14 The light ray on the left side wall of the first protruding portion 171 will not be emitted to the right side.

[0146] Please continue to refer to Figure 14 As shown, the inclination angle of the side wall of the second protruding portion 191 is θ, the distance between the first protruding portion 171 and the second protruding portion 191 in the second direction Y is h1, and the distance between the edge of the first protruding portion 171 close to the second protruding portion 191 and the edge of the second protruding portion 191 close to the first protruding portion 171 in the first direction X is c, c is greater than zero, so θ≥arctan(c / h1) can be obtained, and thus the inclination angle of the side wall of the second protruding portion 191 can be determined by the above formula.

[0147] Referring to Figure 15 As shown, in the fifth example embodiment, the orthographic projection of the first protruding portion 171 on the display substrate 100 covers the sub-pixel 20, and the orthographic projection of the first protruding portion 171 on the display substrate 100 is located in the orthographic projection of the first groove 181 on the display substrate 100, that is, the orthographic projection of the first protruding portion 171 on the display substrate 100 is located in the orthographic projection of the second protruding portion 191 on the display substrate 100. As described above, the orthographic projection of the first protruding portion 171 on the display substrate 100 and the orthographic projection of the first groove 181 on the display substrate 100 have been described in detail, and thus will not be described here.

[0148] Referring to Figure 16 As shown, the structure of the first protruding part 171 is the same as that of the above-mentioned embodiments, and thus, will not be described here again. The second light extraction layer 18 can include a first layer 182 and a second layer 183. The first layer 182 is arranged at the light-out side of the display substrate 100, specifically, the first layer 182 is arranged at the side of the encapsulation layer group 14 away from the display substrate 100, and the height of the first layer 182 in the second direction Y is substantially the same as the height of the first protruding part 171 in the second direction Y, so that the first layer 182 covers the side wall of the encapsulation layer group 14 and the first protruding part 171.

[0149] The display panel can further include a color filter layer 21, and the color filter layer 21 can include a light filtering part 211 and a light shielding part 212. The light filtering part 211 can include a red light filtering part 211, a green light filtering part 211, and a blue light filtering part 211.

[0150] The color filter layer 21 is arranged at the side of the first light extraction layer 17 and the first layer 182 away from the display substrate 100. The light filtering part 211 is arranged at the side of the first light extraction layer 17 away from the display substrate 100, that is, the light filtering part 211 is arranged opposite to the first light extraction layer 17; and the light shielding part 212 is arranged at the side of the first layer 182 away from the display substrate 100, that is, the light shielding part 212 is arranged opposite to the first layer 182.

[0151] The light filtering part 211 can be reused as the third light extraction layer 19, that is, the light filtering part 211 can play the role of filtering light as the light filtering part 211, and can play the role of converging refracted light as the third light extraction layer 19 in cooperation with the second light extraction layer 18.

[0152] Specifically, the light filtering part 211 can include a first part 2111 and a second part 2112 arranged in layers, the second part 2112 is located at the side of the first part 2111 away from the display substrate 100, the first part 2111 is connected with the light shielding part 212, and the thickness of the first part 2111 in the second direction is substantially the same as the thickness of the light shielding part 212. The second part 2112 protrudes from the first part 2111 in the first direction, and the side wall of the second part 2112 is arranged as an inclined surface, which can refract the incident refracted light again, so that the second part 2112 is reused as the second protruding part 191. The calculation method of the inclination angle of the side wall of the second part 2112 is the same as that of the inclination angle θ of the side wall of the second protruding part 191 in the fifth example embodiment, and thus, will not be described here again. Reusing part of the color filter layer 21 as the second protruding part 191 can reduce the process flow of manufacturing the second protruding part 191 in one step, increase the manufacturing efficiency, and reduce the cost.

[0153] It should be noted that the spacing h1 between the first protrusion 171 and the second protrusion 191 in the second direction Y is the thickness of the first portion 2111 or the light shielding portion 212.

[0154] The second layer 183 is arranged on the side of the color filter layer 21 away from the display substrate 100. The first recess 181 is arranged on the second layer 183 and is located on the side of the second layer 183 close to the display substrate 100, so that the second layer 183 covers the third light extraction layer 19 (the second protrusion 191).

[0155] Referring to Figure 17 In the present example embodiment, the light filtering portion 211 is not reused as the third light extraction layer 19, and the structure of the first protrusion 171 is the same as that of the above-described embodiments, and thus will not be described again here.

[0156] The second light extraction layer 18 can include a first layer 182, a second layer 183, and a third layer 184. The first layer 182 is arranged on the light-emitting side of the display substrate 100, specifically, the first layer 182 is arranged on the side of the encapsulation layer group away from the display substrate 100, and the height of the first layer 182 in the second direction Y is substantially the same as the height of the first protrusion 171 in the second direction Y, so that the first layer 182 covers the side wall of the encapsulation layer group and the first protrusion 171.

[0157] The display panel can further include a color filter layer 21, and the color filter layer 21 can include a light filtering portion 211 and a light shielding portion 212. The light filtering portion 211 can include a red light filtering portion 211, a green light filtering portion 211, and a blue light filtering portion 211.

[0158] The color filter layer 21 is arranged on the side of the first light extraction layer 17 and the first layer 182 away from the display substrate 100. The light filtering portion 211 is arranged on the side of the first light extraction layer 17 away from the display substrate 100, that is, the light filtering portion 211 is arranged opposite to the first light extraction layer 17; and the light shielding portion 212 is arranged on the side of the first layer 182 away from the display substrate 100, that is, the light shielding portion 212 is arranged opposite to the first layer 182.

[0159] The light filtering portion 211 can include a first portion 2111 and a second portion 2112 arranged in layers. The second portion 2112 is located on the side of the first portion 2111 away from the display substrate 100, and the first portion 2111 is connected to the light shielding portion 212. The thickness of the first portion 2111 in the second direction is substantially the same as the thickness of the light shielding portion 212. The second portion 2112 protrudes from the first portion 2111 in the first direction. Since the second portion 2112 is not reused as the third light extraction layer 19, the width of the second portion 2112 in the first direction is set to be larger in the present example embodiment, so as to avoid light from being emitted from the side wall of the light filtering portion 211, and instead make the light emitted from the side of the light filtering portion 211 away from the display substrate 100.

[0160] The second layer 183 is arranged on the side of the color film layer 21 away from the display substrate 100, and the second layer 183 completely covers the color film layer 21.

[0161] The third light extraction layer 19 is arranged on the side of the second layer 183 away from the display substrate 100, and the specific structure of the third light extraction layer 19 is the same as that of the third light extraction layer 19 in the fourth example embodiment, and thus is not described herein again.

[0162] The third layer 184 is arranged on the side of the second layer 183 and the third light extraction layer 19 away from the display substrate 100, and the first groove 181 is arranged on the third layer 184 and located on the side of the third layer 184 close to the display substrate 100. Therefore, the third layer 184 covers the third light extraction layer 19 (the second protruding part 191).

[0163] Referring to Figure 11 As shown in FIG. 1, the second layer 183 can not be arranged, and the second protruding part 191 can be directly formed on the side of the color film layer 21 away from the substrate 1.

[0164] Please continue to refer to Figure 1 As shown in FIG. 1, the display panel can further include a circular polarizer 15 and a cover plate 16. The circular polarizer 15 is arranged on the side of the third light extraction layer away from the display substrate. The circular polarizer 15 can include a 1 / 4 wave plate 151 and a polarizer 152 arranged in sequence, and the 1 / 4 wave plate 151 is closer to the display substrate 100 than the polarizer 152. The cover plate 16 is arranged on the side of the circular polarizer 15 away from the display substrate 100.

[0165] Based on the same inventive concept, the example embodiments of the present disclosure provide a display device, which can include the display panel of any one of the above. The specific structure of the display panel has been described in detail above, and thus is not described herein again.

[0166] The specific type of the display device is not particularly limited, and any type of display device commonly used in the art can be used, for example, a mobile device such as a mobile phone, a wearable device such as a watch, a VR device, and the like. A person skilled in the art can select a corresponding display device according to the specific use of the display device, and thus is not described herein again.

[0167] It should be noted that the display device includes other necessary components and components in addition to the display panel. For example, a display device includes a housing, a circuit board, a power cord, and the like. A person skilled in the art can supplement a corresponding display device according to the specific use requirements of the display device, and thus is not described herein again.

[0168] Compared with the prior art, the display device provided by the example embodiments of the present disclosure has the same beneficial effects as the display panel provided by the above example embodiments, and thus is not described herein again.

[0169] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A display panel, wherein, include: The display substrate includes multiple sub-pixels; A first light extraction layer is disposed on the light-emitting side of the display substrate. The first light extraction layer includes a plurality of first protrusions, and the orthographic projection of the first protrusions on the display substrate overlaps with the orthographic projection of the sub-pixel on the display substrate. A second light extraction layer is disposed on the light-emitting side of the display substrate and covers at least a portion of the first protrusion. The second light extraction layer includes a plurality of first grooves. The orthographic projection of the first protrusion on the display substrate overlaps with the orthographic projection of the first groove on the display substrate. The refractive index of the second light extraction layer is less than that of the first light extraction layer. The angle between the sidewall of the first protrusion and the display surface of the display substrate is α. α≥arctan[(a+b) / h]; Where a is the distance between the edge of the first protrusion and the edge of the sub-pixel in the first direction, b is the length of the sub-pixel in the first direction, and h is the distance between the first protrusion and the sub-pixel in the second direction. The angle between the sidewall of the first groove and the display surface of the display substrate is β. β > arctan[h / (a+b)]; Where a is the distance between the edge of the first protrusion and the edge of the sub-pixel in the first direction, b is the length of the sub-pixel in the first direction, and h is the distance between the first protrusion and the sub-pixel in the second direction; The second direction is perpendicular to the display surface of the display substrate, and the first direction is parallel to the display surface of the display substrate.

2. The display panel according to claim 1, wherein, The display panel also includes: A third light extraction layer is disposed on at least a portion of the second light extraction layer on the side away from the display substrate, at least a portion of the third light extraction layer is located within the first groove, and the refractive index of the third light extraction layer is greater than the refractive index of the second light extraction layer.

3. The display panel according to claim 2, wherein, The height of the sidewall of the first protrusion in the second direction decreases as the distance from the center of the sub-pixel in the first direction increases.

4. The display panel according to claim 3, wherein, The sub-pixel is located on the same side of the first normal L1 of the sidewall of the first protrusion, and on the side of the first normal L1 away from the second light extraction layer.

5. The display panel according to claim 3, wherein, The height of the groove sidewall of the first groove in the second direction increases with the distance from the center of the sub-pixel in the first direction.

6. The display panel according to claim 5, wherein, The display panel also includes: A color filter layer is disposed on the light-emitting side of the display substrate, and the color filter layer includes a light-filtering part and a light-shielding part.

7. The display panel according to claim 6, wherein, The color filter layer is disposed on the side of the second light extraction layer away from the display substrate, and at least a portion of the light filter portion is reused as the third light extraction layer.

8. The display panel according to claim 7, wherein, The filter portion includes a first portion and a second portion stacked sequentially. The first portion is closer to the second light extraction layer than the second portion. The first portion is reused as the second protrusion of the third light extraction layer.

9. The display panel according to claim 3, wherein, The height of the groove sidewall of the first groove in the second direction decreases as the distance from the center of the sub-pixel in the first direction increases.

10. The display panel according to claim 9, wherein, The sidewall of the first protrusion is located on the same side of the second normal of the groove sidewall of the first groove, and is located on the side of the second normal closer to the display substrate. The sidewall of the first protrusion and the groove sidewall of the first groove are located on the same side of the same cross section along the second direction.

11. The display panel according to claim 9, wherein, The third light extraction layer is disposed within the first groove, and the third light extraction layer disposed within the first groove is a second protrusion.

12. The display panel according to claim 11, wherein, The second light extraction layer includes: The first layer is disposed on the light-emitting side of the display substrate and covers at least a portion of the first protrusion; The second layer is located on the side of the first layer away from the display substrate, and the first groove is located in the second layer.

13. The display panel according to claim 12, wherein, The display panel also includes: A color filter layer is disposed on the side of the first light extraction layer and the first layer away from the display substrate, and the color filter layer includes a light filtering portion and a light blocking portion; the second layer is located on the side of the color filter layer away from the display substrate.

14. The display panel according to claim 13, wherein, At least a portion of the filter section is reused as the third light extraction layer.

15. The display panel according to claim 14, wherein, The filter section includes a first part and a second part stacked in sequence. The first part is closer to the second light extraction layer than the second part, and the second part is reused as the third light extraction layer.

16. The display panel according to claim 13, wherein, The second light extraction layer further includes: The third layer is disposed between the first layer and the second layer, and the third layer is located on the side of the color filter layer away from the display substrate.

17. The display panel according to any one of claims 2 to 16, wherein, The first groove is configured as a through hole.

18. The display panel according to claim 2, wherein, The display panel also includes: An encapsulation layer assembly is disposed between the display substrate and the first light extraction layer; A circular polarizer is disposed on the side of the third light extraction layer away from the display substrate; A cover plate is disposed on the side of the circular polarizer away from the display substrate.

19. A display device, wherein, include: The display panel according to any one of claims 1 to 18.

Images